Statement I : ADA deficiency disorder is caused due to the excessive synthesis of gene for adenosine deaminase.

Statement II :It affects the human immune system.

Only statement II is correct.

The correct answer is Option (2) →Only statement II is correct .

Gene therapy is a collection of methods that allows correction of a gene defect that has been diagnosed in a child/embryo. Here genes are inserted into a person’s cells and tissues to treat a disease.

Correction of a genetic defect involves delivery of a normal gene into the individual or embryo to take over the function of and compensate for the non-functional gene. The first clinical gene therapy was given in 1990 to a 4-year old girl with adenosine deaminase (ADA) deficiency.

This enzyme is crucial for the immune system to function. The disorder is caused due to the deletion of the gene for adenosine deaminase.